it is important_______.A.to careful B.to careless C.careful D.to be careful
人气：148 ℃ 时间：2020-07-01 01:34:24
解答
选d, 考不定式作主语
it 是形式主语,不定式是真正的主语.
作主语的可以是名词,代词,不定式,动名词,不能是形容词,副词.
a, b,没有这种用法,c 是形容词,不能作主语.
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